Hey, /ic/. Do what you do best and tear this apart.
Any particular book you can send me to?
It is obvious that you looked at reference and followed the contours of the hand instead of constructing it. Think in terms of simple shapes, elongated cylinder for the forearm and rectangles for the fingers. Then you flesh out the arm according to your reference. Also the way you make lines is a bad habit. This is known as "chicken scratching" where instead of making a single continous line, you scratch away with smaller lines. The sticky will provide you with more indepth information and get you going.
This is now a critique thread.
Over all I'd say its lacking depth. The background and the figure are pretty much the same shade which takes away from the nice line work. I'd say choose one or the other having tons of detail, but thats not the only fix.
The rest of my critiques are more nitpicky. The right titty wouldn't be a titty anymore if its a craved out chest, and having the line connecting the heart to the eye be straight makes the titty hole look even less like a hole. The neck looks like it's still attached and it just has a weird ring on it. Lines around the entire lips look pretty bad. The hair line on the top head looks odd. The hair getting dark in the bottom right corner is super weird to the composition.